FDA authorizes Moderna and J&J Covid vaccine boosters, permits ‘mix and match’ October 21, 2021 Auto Bot BioPharma, biopharma nl, FDA, Johnson & Johnson, Moderna, Pfizer, Pharma 0 The FDA amended emergency use authorization of the Moderna and Johnson & Johnson Covid-19 vaccines, permitting booster shots. But the agency went further and said that a booster shot may be different than the one given for the primary vaccination.